"When two people commit their lives to each other, government has no right standing in their way," Bloomberg said.

Bloomberg, a graduate of Johns Hopkins University, recently donated $250,000 to the Marylanders for Marriage Equality campaign. Two years ago, he helped support the effort to pass gay marriage in New York.

If passed, Maryland could become the first state in the nation to vote in favor of same-sex marriage at the ballot box. A recent Baltimore Sun poll showed popular support in Maryland for gay marriage.